Biofuel production from palm oil with supercritical alcohols: Effects of the alcohol to oil molar ratios on the biofuel chemical composition and properties

► This process consumes lower energy than the conventional transesterification in SCA. ► The triglyceride conversion was over 98% at the optimal alcohol to oil molar ratio. ► The fuel yield enhanced about 4.7% and 12.9% for SCM and SCE process, respectively. ► This process is promising method to convert palm oil to aromatic-free biofuel.